Pools have chlorine which, as we've been told ad nauseum, kills Wuhan. The only Wuhan pools might not disinfect are aerosol droplets carrying virus. Those droplet eventually land in the water where the chlorine kills them. They could be transmitted being up close to another person although proving the source would be difficult, if not impossible.
Here's the issues with suing. The virus has a 10-14 day incubation period. If someone catches it, how can they prove it came from the pool and not from some other person or place? If someone files suit, it won't be for several months after catching Wuhan. Did they keep a sample of the pool water the day the victim went swimming to check the genetic code of the virus to compare to the genetic code from the victim--which they likely didn't take a sample during the illness. Will the lawyers go back to the pool several months later during discovery to take samples? Remember there is chlorine in those pools not to mention sunlight shining most of the time. If they do go back and take a sample, what is the probability the virus found (if found) months later is identical to the virus which caused the illness given it's highly unlikely anyone kept a sample of the virus initially.
The same defense scenario above could be used on any other suit. Replace swimming pool with basketball arena, football stadium, concert hall, bar or anywhere else. If someone gets sick attending any of the above, were samples of the virus saved from the victim or taken from the venue several months later after recovery and several disinfections? What is the likelihood identical viruses could be found or were saved at the time of infection?
What you described is nothing more than insurance companies using Wuhan to avoid performing according to their policies.